# Copyright (C) 2008, Mads D. Kristensen
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from os.path import sep

def perform(filename):
    # Type check.
    if type(filename) != str:
        raise TypeError('"filename" argument must be of type str.')

    # Validate the filename.
    if '..' in filename or '~' in filename:
        raise IOError('Backtracking is not allowed.')

    # Read the file.
    infile = open('see' + sep + 'storage' + sep + filename, 'r')
    data = infile.read()
    infile.close()
    return data
    
